games/SpaceCadetPinball: Use current directory not PREFIX

games/SpaceCadetPinball/Makefile

 PORTNAME=	SpaceCadetPinball
 PORTVERSION=	1.1.1.20211010
+PORTREVISION=	1
 CATEGORIES=	games
 
 MAINTAINER=	nc@FreeBSD.org

games/SpaceCadetPinball/files/patch-SpaceCadetPinball_winmain.cpp

+--- SpaceCadetPinball/winmain.cpp.orig	2021-10-14 18:28:42 UTC
++++ SpaceCadetPinball/winmain.cpp
+@@ -56,7 +56,7 @@ int winmain::WinMain(LPCSTR lpCmdLine)
+ 		SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Could not initialize SDL2", SDL_GetError(), nullptr);
+ 		return 1;
+ 	}
+-	BasePath = SDL_GetBasePath();
++	BasePath = SDL_strdup("./");
+ 
+ 	pinball::quickFlag = strstr(lpCmdLine, "-quick") != nullptr;
+ 	DatFileName = options::get_string("Pinball Data", pinball::get_rc_string(168, 0));